Fix assertion

Author: jpountz

lucene/core/src/java/org/apache/lucene/search/DenseConjunctionBulkScorer.java

@@ -305,7 +305,7 @@ private void scoreWindowUsingLeapFrog(
       int max)
       throws IOException {
     assert twoPhases.size() > 0;
-    assert approximations.size() > twoPhases.size();
+    assert approximations.size() >= twoPhases.size();
 
     if (approximations.size() == 1) {
       // scoreWindowUsingLeapFrog is only used if there is at least one two-phase iterator, so our